[SIPForum-discussion] Regarding SDP in 180 and 200

[pankaj.kmr at wipro.com]

Hi Rajesh,

 

18x reliable message SDP will be final one and 200 message SDP will be
ignored.

 

If callee party would like to place new SDP, it has to be through
re-INVITE. 

 

Regards

Pankaj

 

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of DEEPAK SHARMA
Sent: Tuesday, December 18, 2007 12:30 PM
To: Sword Chen
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Regarding SDP in 180 and 200

 

H iSword,

Thanks for the info.
But i am really willing to knwo about the outcome of the Point Rajesh
has presented.

"Suppose we are sending INVITE (100Rel) to UAS, so UAS should send back
al lthe Provisional 1xx responses reliably.(
draft-ietf-sip-100rel-06.txt)
<http://tools.ietf.org/html/draft-ietf-sip-100rel-06.txt> 

What will happen in this case, you can not igore Media SDP info present
in 1XX messages, 
It might possible that we are giving priority to 200 OK(INVITE) over 1xx
messages.. 

Kindly Confirm ??




On Dec 18, 2007 11:48 AM, Sword Chen <swordchen at posteritytech.com>
wrote:

Hi Rajesh,

18x message has no response, so it is not reliable message, not like
200OK
and ACK, so normally, you can add the SDP into 200 OK or ACK message as
the
final of this session. so what will happen if the 18X packet lost, if
there 
is some different between 18X SDP and 200....
and most UAC vendors support  this case.



----- Original Message -----
From: "RajeshK.R 71316" < rajeshkr at huawei.com
<mailto:rajeshkr at huawei.com> >
To: "Sword Chen" <swordchen at posteritytech.com>
Cc: <discussion at sipforum.org >
Sent: Tuesday, December 18, 2007 1:46 PM
Subject: Re: [SIPForum-discussion] Regarding SDP in 180 and 200


> Hi Sword,
>
>   What will happen if UAS sending 180 SDP reliably? Whether UAC will 
> contine with 180 SDP only in this case, even UAS sending different SDP
in
> 200 ?  What the statement "The UAC MUST treat the first  session
> description it receives as the answer, and MUST ignore any session 
> descriptions in subsequent responses to the initial  INVITE" in RFC
3261
> means?
>
> Regards
> Rajesh
>
>
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> ----- Original Message -----
> From: Sword Chen < swordchen at posteritytech.com>
> Date: Tuesday, December 18, 2007 10:14 am
> Subject: Re: [SIPForum-discussion] Regarding SDP in 180 and 200
>
>> Hi, Man, 
>>
>> I don't think so, the 18X is not reliable response, so the UAC
>> will take the 200 SDP when the called party answered.
>> like
>>
>> 180:
>> G729
>>
>> 200:
>> G723
>>
>> after get the 180 message the UAC will decode the RTP in G729
>> format, and that is the same as the 183 message,
>> once the UAC got the 200 message, it must change the codec from 
>> G729 to G723. we ready tested this case.
>>
>> :D
>>  ----- Original Message -----
>>  From: Rajesh
>>  To: discussion at sipforum.org 
>>  Sent: Tuesday, December 18, 2007 11:45 AM
>>  Subject: [SIPForum-discussion] Regarding SDP in 180 and 200
>>
>>
>>  Hi all,
>>
>>    If SDP in 180 and 200 responses are different, How UAC should 
>> behave? According to RFC 3261 "If the initial offer is in an
>> INVITE, the answer MUST be in a reliable non-failure message from
>> UAS back to UAC which is correlated to that INVITE. For this 
>> specification, that is only the final 2xx response to that INVITE.
>> That same exact answer MAY also be placed in any provisional
>> responses sent prior to the answer. The UAC MUST treat the first 
>> session description it receives as the answer, and MUST ignore any
>> session descriptions in subsequent responses to the initial
>> INVITE."
>>
>>
>>
>>  What I understood from this one means, if SDP in 180 and 200 are 
>> different also, UAC will take SDP in 180 as answer. Is it like
>> that? What will happen if 180 with SP is not sending reliably ?
>>
>>
>>
>>  Thanks in Advance
>>
>>  Rajesh
>>
>>
>>
>>  Rajesh K R
>>
>>  Software Engineer
>>
>>  Huawei Technologies
>>
>>  Bangalore
>> 
>>  Mob:009779803359762
>>
>>
>>
>>
>>
>> -------------------------------------------------------------------
>> -----------
>>
>> 
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-- 
Thanks 
Deepak Sharma 

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